Direct injection type high-pressure injection device

Abstract

The utility model relates to a direct injection type high-pressure injection device which comprises a receiving chamber, an injector and a mixer, the injector and the mixer are both communicated with the receiving chamber, the injector and the mixer are horizontally distributed on the same axis, the injector is located on the left side of the receiving chamber, and the mixer is located on the right side of the receiving chamber. Jet energy of high-pressure gas is concentrated for direct jet impact and injection drainage, and the high-pressure gas and curing agent powder are mixed and compressed to form rotational flow, so that the pneumatic conveying capacity is enhanced, the pressure loss of a pipeline is reduced, and the service life is prolonged. A mixer formed by the shrinkage pipe, the mixing pipe and the diffusion pipe can convert an initial non-uniform flow field of gas-solid two-phase flow into a later-stage uniform flow field by utilizing the space structure change of diameter shrinkage-equal diameter-diameter expansion and the optimization design of the geometric dimension, and the gas-solid fluid dynamic pressure of the pipeline is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of soft soil foundation dry spraying mixing pile construction machinery and equipment, in particular to a direct spraying high-pressure jetting device. Background Art

[0002] Soft soil foundations are widely distributed in my country, especially in the areas of sea, lakes and rivers, where the foundation soil has a high moisture content, a large void ratio and high compressibility. For this type of soft soil foundation, land development requires a large number of soft soil foundation treatment projects. In the 1960s, Sweden successfully developed dry spraying mixing pile technology, which used dry powder materials such as lime or cement to reinforce saturated soft soil or silt foundations. This technology, with its dual technical functions of water absorption and solidification, can greatly improve the strength and bearing capacity of the reinforced foundation. The application of dry spraying mixing pile technology in civil engineering projects can achieve good soft foundation reinforcement treatment effects. However, the existing construction background of dry spraying mixing piles mainly uses manually controlled pressure tanks, general ejectors and feed pipeline equipment. During the construction process, powder feeding and ejector operation are both manual and completely based on workers' experience. Due to the differences in the skill level and proficiency of construction workers, the powder feeding and injection conveying often become non-uniform and unstable, which is particularly prone to blockage of the conveying pipeline of the solidifying material, resulting in discontinuity in the feeding, injection and conveying of the curing agent powder in the dry spraying mixing pile construction, uneven and unstable curing agent injection amount at the bottom nozzle of the construction drill, and difficulty in ensuring the quality of the mixing pile construction. The main reason for the above-mentioned technical defects is that the structural design of the injector and the mixer is unreasonable, the curing agent powder injection cannot be stable and continuous, and it is impossible to provide sufficient pneumatic conveying capacity for the gas-solid two-phase flow. The specific technical defects are: the structural design of the powder injector is unreasonable, the working nozzle has placement misalignment and structural design problems, and the mixer also adopts an equal diameter structure, which makes it difficult for the gas-solid two-phase flow to fully mix and compress and generate a gas-solid two-phase vortex, resulting in insufficient pneumatic conveying capacity of the curing agent powder and frequent blockage of the conveying pipeline. Utility Model Content

[0003] The utility model aims to overcome the shortcomings of the prior art and provide a direct injection high-pressure injection device.

[0004] The purpose of the utility model is achieved through the following technical solution. The direct injection high-pressure injection device includes a receiving chamber, an injector and a mixer. The injector and the mixer are both connected to the receiving chamber. The injector and the mixer are horizontally distributed on the same axis, and the injector is located on the left side of the receiving chamber, and the mixer is located on the right side of the receiving chamber.

[0005] Preferably, the injector comprises an injection pipe and a working nozzle, the injection pipe is inserted into the left side wall of the receiving chamber and is fixedly and sealingly connected thereto, the working nozzle is fixedly connected to the injection pipe, and the cross-sectional centers of the injection pipe and the working nozzle are on the same axis as the cross-sectional center of the mixer.

[0006] Preferably, the injector is located directly behind the mixer, the jet end of the working nozzle is located on the right side of the perpendicular midline of the receiving chamber, and the position of the jet end of the working nozzle can be adjusted by changing the length of the working nozzle.

[0007] Preferably, the inner diameter of the working nozzle is a structure that first contracts and then expands along the inside of the nozzle toward the jet port, the inner diameter of the jet end of the working nozzle is 10mm~20mm, and the enlarged cone angle of the inner diameter of the jet end is 1°~10°; the diameter of the high-speed and high-pressure gas jet beam ejected by the working nozzle is smaller than the diameter of the circular through hole.

[0008] Preferably, when the receiving chamber adopts a cylindrical structure, the mixer includes a shrinkage tube and a mixing tube connected in sequence, the shrinkage tube is connected to a circular through hole provided on the right side wall of the receiving chamber, and the mixing tube is connected to the gas material conveying pipeline; the mixer adopts a variable space of a shrinking diameter and equal diameter structure, the diameter of the shrinkage tube changes from large to small along the direction from the receiving chamber to the mixer and is in a truncated cone shape, and the diameter of the mixing tube is a tube of equal inner diameter.

[0009] Preferably, when the receiving chamber adopts a bent tube structure, the mixer includes a contraction tube, a mixing tube and a diffusion tube connected in sequence, the contraction tube is connected to a circular through hole provided on the right side wall of the receiving chamber, and the mixing tube is connected to the gas material conveying pipeline; the mixer adopts a variable space of a reducing, equal diameter and expanding diameter structure, the diameter of the contraction tube changes from large to small and is truncated in a cone shape along the direction from the receiving chamber to the mixer, the diameter of the mixing tube is a constant inner diameter tube, and the diameter of the diffusion tube changes from small to large and is truncated in a cone shape along the direction from the receiving chamber to the mixer.

[0010] Preferably, the top of the receiving chamber is provided with a switch valve and a feed port in sequence from top to bottom, which are used for switching the powder feed channel and receiving the curing agent powder respectively; the gas conveying pipeline is connected to the front end of the mixer and is used to continue to convey the gas-solid two-phase mixed vortex ejected by the mixer forward.

[0011] The advantage of the direct injection high-pressure injection device of the utility model is that it concentrates the injection energy of high-pressure gas to directly inject impact and induced drainage, mixes and compresses the high-pressure gas with the curing agent powder to form a swirl, improves the pneumatic conveying capacity by pressurization, reduces the pressure loss of the pipeline, and realizes the long-distance transportation of the gas-solid two-phase fluid medium. Specifically, the direct injection structure layout is characterized by placing the injector directly behind the mixer, and aligning the center of the working nozzle with the center of the mixer. Since the center of the injector and the center of the mixer are on the same axis, by adjusting the expansion angle of the working nozzle and adjusting the distance between the working nozzle and the vertical section of the circular through hole on the right side wall of the receiving chamber, it can be ensured that the high-pressure gas flow jetted by the working nozzle can be completely injected into the mixer without airflow reflection; the high-pressure gas jet energy is saved to the greatest extent, and a negative pressure area of ​​the receiving chamber is formed, and then the curing agent powder is smoothly sucked into the mixer by the induced flow effect.

[0012] Different from the equal-diameter mixers used in the prior art, the utility model forms a mixer by sequentially connecting a contraction tube, a mixing tube and a diffusion tube. The mixer adopts a combined tube structure of an inverted truncated cone, a cylindrical shape and a right truncated cone. Through the spatial structure change of reduction-equal diameter-expansion, and the optimized design of geometric dimensions, the initial non-uniform flow field of the gas-solid two-phase flow can be transformed into a later uniform flow field through mixing and compression, and a gas-solid two-phase vortex flow that is beneficial to long-distance pneumatic transportation is quickly generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a schematic structural diagram of a direct-injection high-pressure injection device in which a receiving chamber adopts a bent pipe structure.

[0014] Figure 2 The utility model is a schematic structural diagram of a direct-injection high-pressure injection device in which a receiving chamber adopts a cylindrical structure.

[0015] Figure 3 It is a schematic diagram of the gas-solid mixing flow field of the high-pressure injection device unit of the utility model.

[0016] Figure 4 It is a schematic diagram of the structure of various working nozzles of the utility model.

[0017] The numbers in the accompanying drawings are: 1, receiving chamber; 13, circular through hole; 2, ejector; 21, injection pipe; 22, working nozzle; 3, mixer; 31, contraction tube; 32, mixing tube; 33, diffusion tube; 9, gas material conveying pipeline. DETAILED DESCRIPTION

[0018] The following is a detailed introduction to the utility model in conjunction with the accompanying drawings: Figures 1 to 4As shown, the utility model includes a receiving chamber 1, an ejector 2 and a mixer 3, wherein the ejector 2 and the mixer 3 are both connected to the receiving chamber 1, the ejector 2 and the mixer 3 are horizontally distributed along the same axis, and the ejector 2 is located on the left side of the receiving chamber 1, and the mixer 3 is located on the right side of the receiving chamber 1.

[0019] The injector 2 includes an injection pipe 21 and a working nozzle 22. The injection pipe 21 is inserted into the left side wall of the receiving chamber 1 and is fixedly and sealed therewith. The working nozzle 22 is fixedly connected to the injection pipe 21, and the cross-sectional centers of the injection pipe 21 and the working nozzle 22 are on the same axis as the cross-sectional center of the mixer 3.

[0020] The injector 2 is located directly behind the mixer 3, and the pressure of the working nozzle 22 ejected is 0.2MPa~0.95MPa, and the horizontal high-pressure gas flow can be completely injected into the mixer 3; the injection end of the working nozzle 22 is located on the right side of the mid-vertical line of the receiving chamber 1, and the injection end position of the working nozzle 22 can be adjusted by changing the length of the working nozzle 22.

[0021] The inner diameter of the working nozzle 22 is a structure that first contracts and then expands along the inside of the nozzle toward the jet port. The inner diameter of the jet end of the working nozzle 22 is 10mm~20mm, and the enlarged cone angle of the inner diameter of the jet end is 1°~10°; when the length and structure of the working nozzle 22 are determined, it is required that at the vertical section of the circular through hole 13, the diameter of the high-speed high-pressure gas jet beam ejected by the working nozzle 22 is smaller than the diameter of the circular through hole 13, so that the high-pressure gas jet beam can be completely injected into the contraction tube 31 without generating a reflection effect; at the same time, a negative pressure area is formed in the receiving chamber 1, and the curing agent powder in the receiving chamber 1 is gradually sucked into the mixer 3 through the induced jet flow around the high-pressure gas jet beam.

[0022] The flow rate and pressure of the high-pressure gas jet beam from the working nozzle 22 entering the contraction tube 31 are much higher than the flow rate and pressure of the curing agent powder flow around it, forming a non-uniform flow field in the contraction tube 31 area. As the inner diameter of the contraction tube 31 gradually decreases and the friction of the tube wall of the mixing tube 32 continues to increase, the high-pressure gas and the curing agent powder are gradually mixed, compressed and fluidized. The flow rate of the gas-solid two-phase mixed fluid on each cross section of the central axis of the mixing tube 32 with equal inner diameter gradually tends to be evenly distributed, and the flow rate on the outlet cross section of the mixing tube 32 is close to uniform distribution. The high-pressure gas and the curing agent powder are mixed and compressed and fluidized in the mixing tube 32 to form a vortex and enter the diffuser 33. When the gas-solid two-phase fluid with uniform flow rate flows through the diffuser 33, the flow rate will be increased and the dynamic pressure will increase. Then the gas-solid two-phase fluid enters the gas-material conveying pipe 9 at the right end, and is then continued to be conveyed to the feed channel 102 of the drilling tool by pneumatic conveying.

[0023] As attached Figure 2 As shown, when the receiving chamber 1 adopts a cylindrical structure, the mixer 3 includes a shrink tube 31 and a mixing tube 32 connected in sequence, the shrink tube 31 is connected to the circular through hole 13 provided on the right side wall of the receiving chamber 1, and the mixing tube 32 is connected to the gas delivery pipeline 9; the mixer 3 adopts a variable space of a shrinking and equal diameter structure, the diameter of the shrink tube 31 changes from large to small along the direction from the receiving chamber 1 to the mixer 3 and is in a truncated cone shape, the truncated cone contraction angle is 8°~30° and the length is not less than 100mm, the diameter of the mixing tube 32 is a constant inner diameter tube, the inner diameter is 28mm~55mm and the length is not less than 200mm, and the inner diameter of the mixing tube 32 is equal to the inner diameter of the gas delivery pipeline 9.

[0024] As attached Figure 1 As shown, when the receiving chamber 1 adopts a bent pipe structure, the mixer 3 includes a shrink tube 31, a mixing tube 32 and a diffuser 33 connected in sequence, the shrink tube 31 is connected to the circular through hole 13 provided on the right side wall of the receiving chamber 1, and the mixing tube 32 is connected to the gas material conveying pipeline 9; the mixer 3 adopts a variable space of a shrinking, equal diameter and expanding structure, the diameter of the shrink tube 31 changes from large to small and is truncated in the direction from the receiving chamber 1 to the mixer 3, and its truncated cone contraction angle is 10°~40° and the length is 50mm~300mm, the diameter of the mixing tube 32 is a constant inner diameter tube, its inner diameter is 25mm~40mm and the length is 60mm~450mm, the diameter of the diffuser 33 changes from small to large and is truncated in the direction from the receiving chamber 1 to the mixer 3, and its truncated cone expansion angle is 2°~15° and the length is 120mm~400mm.

[0025] The top of the receiving chamber 1 is provided with a switch valve 12 and a feed port 11 in sequence from top to bottom, which are used for switching the powder feeding channel and receiving the curing agent powder respectively; the gas conveying pipeline 9 is connected to the front end of the mixer 3 and is used to continue to convey the gas-solid two-phase mixed vortex ejected by the mixer 3 forward.

[0026] In addition, the solidifying materials that can be used in the high-pressure spraying system include: lime, cement, curing agent, fly ash, fine sand and other dry materials; and this direct-injection high-pressure spraying device is suitable for dry spraying and wet spraying construction methods, and the specific curing agent material can be selected according to the project requirements and foundation soil conditions.

[0027] The present invention is not limited to the above-mentioned embodiments. Regardless of any changes in shape or material composition, any structural design provided by the present invention is a variation of the present invention and should be considered within the protection scope of the present invention.

Claims

1. A direct injection high-pressure injection device, comprising a receiving chamber (1), an injector (2) and a mixer (3), characterized in that: The injector (2) and the mixer (3) are both connected to the receiving chamber (1), the injector (2) and the mixer (3) are arranged horizontally on the same axis, the injector (2) is located on the left side of the receiving chamber (1), and the mixer (3) is located on the right side of the receiving chamber (1); the injector (2) comprises an injection pipe (21) and a working nozzle (22), the injection pipe (21) is inserted into the left side wall of the receiving chamber (1) and is fixedly sealed therewith, and the working nozzle (22) is fixedly connected to the injection pipe (21); the inner diameter of the working nozzle (22) is a structure that first contracts and then expands along the inside of the nozzle toward the injection port, and the diameter of the high-speed high-pressure gas injection beam injected by the working nozzle (22) is smaller than the diameter of the circular through hole (13).

2. The direct injection high pressure injection device according to claim 1, characterized in that: The cross-sectional centers of the injection pipe (21) and the working nozzle (22) are located on the same axis as the cross-sectional center of the mixer (3).

3. The direct injection high pressure injection device according to claim 2, characterized in that: The ejector (2) is located directly behind the mixer (3), and the jet end of the working nozzle (22) is located on the right side of the perpendicular midline of the receiving chamber (1), and the position of the jet end of the working nozzle (22) can be adjusted by changing the length of the working nozzle (22).

4. The direct injection high pressure injection device according to claim 2, characterized in that: The inner diameter of the jet end of the working nozzle (22) is 10 mm to 20 mm, and the enlarged cone angle of the inner diameter of the jet end is 1 o ~10º.

5. The direct injection high pressure injection device according to claim 1, characterized in that: When the receiving chamber (1) adopts a cylindrical structure, the mixer (3) comprises a shrink tube (31) and a mixing tube (32) connected in sequence, the shrink tube (31) is connected to a circular through hole (13) provided on the right side wall of the receiving chamber (1), and the mixing tube (32) is connected to a gas material conveying pipeline (9); the mixer (3) adopts a variable space of a shrinking diameter and a constant diameter structure, the diameter of the shrink tube (31) changes from large to small along the direction from the receiving chamber (1) to the mixer (3) and is in a truncated cone shape, and the diameter of the mixing tube (32) is a tube of constant inner diameter.

6. The direct injection high pressure injection device according to claim 1, characterized in that: When the receiving chamber (1) adopts a bent pipe structure, the mixer (3) comprises a shrink pipe (31), a mixing pipe (32) and a diffuser (33) which are connected in sequence, the shrink pipe (31) is connected to a circular through hole (13) provided on the right side wall of the receiving chamber (1), and the diffuser (33) is connected to a gas material conveying pipeline (9); the mixer (3) adopts a variable space of a reduced diameter, a constant diameter and an expanded diameter structure, the diameter of the shrink pipe (31) changes from large to small and is in a truncated cone shape along the direction from the receiving chamber (1) to the mixer (3), the diameter of the mixing pipe (32) is a pipe with a constant inner diameter, and the diameter of the diffuser (33) changes from small to large and is in a truncated cone shape along the direction from the receiving chamber (1) to the mixer (3).

7. The direct injection high pressure injection device according to claim 1, characterized in that: The top of the receiving chamber (1) is provided with a switch valve (12) and a feed port (11) in order from top to bottom, and are used for opening and closing the powder feeding channel and receiving the curing agent powder respectively; the gas material conveying pipeline (9) is connected to the front end of the mixer (3) and is used to continue to convey the gas-solid two-phase mixed vortex ejected from the mixer (3) forward by means of pneumatic conveying.

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